AFAIK, when you select to have a start-up or shut-down logo, there's an option to have them all selected and to display at random (e.g. you'd get a different logo when you start and shut down ... each time_). That what you mean? If so, that's accessible by going to Settings>Appearance>Boot logo (or Power-off logo)>random logo. Note that you get to random logo by scrolling to the end of your picture file, a-l-l the way to the end. At least, it works this way in version 15.2 that I'm running on my PB360.
However, I don't think there's a way to have the PB360 randomly cycle through the photos like a slideshow. But, I could be wrong...
Hope that answered your question.
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